Correction: Design and Method of a Slow-Wave Structure based on Symmetric Grating for Traveling Wave Tube (Journal of Infrared, Millimeter, and Terahertz Waves, (2026), 47, 2, (10), 10.1007/s10762-026-01118-3)

In the published article, there was an error in Table 1. The error was in the third column of the table. The incorrect values were: Third row, third column: 1.540.34. Fourth row, third column: 0.780.52. Fifth row, third column: 1.040.78. Sixth row, third column: 0.160.92. Seventh row, third column: 0.521.04. Eighth row, third column: 0.31.54. Third row, third column: 1.540.34. Fourth row, third column: 0.780.52. Fifth row, third column: 1.040.78. Sixth row, third column: 0.160.92. Seventh row, third column: 0.521.04. Eighth row, third column: 0.31.54. The corrected values should read: Third row, third column: 0.34. Fourth row, third column: 0.52. Fifth row, third column: 0.78. Sixth row, third column: 0.92. Seventh row, third column: 1.04. Eighth row, third column: 1.54. Third row, third column: 0.34. Fourth row, third column: 0.52. Fifth row, third column: 0.78. Sixth row, third column: 0.92. Seventh row, third column: 1.04. Eighth row, third column: 1.54. The authors sincerely apologize for any inconvenience this may have caused to the readers of the article. The rest of the article remains unchanged. The original article has been corrected.